Wireless sensor networks (WSNs) have a wide variety of military and civil applications. The sensor nodes are powered by batteries with limited energy. Hostile or hazardous environments where the sensor nodes are deployed or the sheer number of the sensors prevents replacement or recharge of the batteries. Therefore in WSNs, scheduling of different types of packets is of vital importance to redu...

Modern PCs are equipped with multi-many core capabilities which enhance their computational power and address important issues related to the efficiency of the scheduling processes of the modern operating system in such hybrid architectures. The aim of our work is to implement a simulation framework devoted to the study of the scheduling process in hybrid systems in order to improve the system ...

J2EE is the primary middleware platform for distributed enterprise applications. Current J2EE (Java 2 platform enterprise edition) transaction scheduling to entity beans is still a simple First-Come First-Served (FCFS) policy. Due to this simple policy, transaction manager is unable to distinguish the key tasks from the trivial ones and the performance of the key tasks is reduced when the serve...

In high speed networks, the Strict Priority (SP) scheduling discipline is perhaps the most common and simplest method to schedule packets from different classes of applications, each with diverse performance requirements. With this discipline, however, packets at higher priority levels can starve packets at lower priority levels. To resolve this starvation problem, we propose to assign a parame...

With the advent of new computing technologies, such as cloud computing and contemporary parallel processing systems, the building blocks of computing systems have become multi-dimensional. Traditional scheduling algorithms based on a single-resource optimization like processor fail to provide near optimal solutions. The efficient use of new computing systems depends on the efficient use of all ...

The IEEE 802.11ac standard introduces new downlink multi-user MIMO (DL-MU-MIMO) transmissions to up to four users in order to increase spatial reuse in wireless local area networks (WLANs). We argue that even better WLAN performance can be achieved by slightly modifying the DL-MU-MIMO scheduling. To this end we propose a new queuing mechanism based on the decoupling of EDCA and DL-MU-MIMO sched...

ÐWith effective packet-scheduling mechanisms, modern integrated networks can support the diverse quality-of-service requirements of emerging applications. However, arbitrating between a large number of small packets on a high-speed link requires an efficient hardware implementation of a priority queue. To highlight the challenges of building scalable priority queue architectures, this paper inc...

High performance servers in client/server distributed systems must manage and multiplex disk I/O resources eeciently and fairly between multiple clients. In digital multimedia systems, clients may make requests of varying urgencies. The traditional approach to this problem thus assigns priorities to disk requests. High priority requests are scheduled rst, with low priority requests served only ...

The physical activities of a real wireless network are represented by events which are the main components of a discrete event simulation (DES) system and are produced by its event generator during simulation time. Each network service (e.g. voice, data and video) constitutes an event for a particular mobile user. A critical component within the simulation system, called scheduler, runs by sele...